Crunches are outdated and easy to perform improperly. At best, they help only your abs; at worst, they strain your discs. Instead of crunching, try basic planks and side planks to strengthen your core. When done correctly, planks activate almost every muscle in your body. Planks work your abs, challenge your stability, and strengthen your muscles!

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Lie on the floor on your stomach. Place your feet about hip's width apart as you tuck your toes and place your forearms on the ground parallel to each other, palms facing down. Tighten your core and look down. Keeping your spine neutral and body straight from the crown of your head to your heels, press back with your heels onto your forearms. Hold for one minute or until you reach fatigue.